旋转超高压双流道PDC钻头流场数值模拟研究

A numerical simulation study of the flow field of the rotary superhigh pressure double-channel PDC drill bit

基于计算流体力学理论,针对旋转条件下超高压双流道PDC钻头的流场进行了数值模拟研究。结果表明,在旋转条件下超高压双流道PDC钻头的流场与不旋转时井底流场相似,也可以分为4个区域,即冲击区、漫流区、漩涡区和上返区;但是随着钻头的旋转,井底流场部分水力特性发生了改变。该结论在超高压双流道PDC钻头的水力结构设计方面起到了重要作用,同时也为今后的钻头结构设计提供了新的研究手段。

Based on the computational fluid dynamic theory,a numerical simulation of the flow field of the superhigh pressure double-channel PDC drill bit in rotation was conducted.The result showed that the flow field of the bit in rotation was similar to the bottom-hole flow field when it was not in rotation.Four zones were divided,including impact zone,cross-flow zone,swirl zone and up-hole zone.However,with the rotation of the bit,some hydraulic properties of the downhole flow field changed.This conclusion plays an important role in the structural design of the drill bit in question and it offers a new research method for the future design of the bit structure.